<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="js/jquery-1.12.4.min.js" type="text/javascript"></script>
</head>
<body>
    <h1>用户登录</h1>
    <form id="frm">
        <input type="text" name="uname" id="uname"/><br/>
        <input type="password" name="upass" id="upass"/><br/>
        <input type="button" value="登录" id="btn_login"/><br/>
    </form>

    <script type="text/javascript">
        $("#btn_login").click(function(){
            let formData = $("#frm").serialize() ;

            $.post("login",formData,function(res){
                console.log(res)
            }) ;
        }) ;
    </script>
</body>
</html>